iOS8中如何将状态栏的字体颜色改为白色

网上的一些方法在我这行不通，

比如：

UIApplication.sharedApplication().statusBarStyle = UIStatusBarStyle.LightContent

、Set the UIViewControllerBasedStatusBarAppearance to YES in the .plist file.

、In the viewDidLoad do a [self setNeedsStatusBarAppearanceUpdate];

、Add the following method:

-(UIStatusBarStyle)preferredStatusBarStyle{
    return UIStatusBarStyleLightContent;
}

最后终于有个方法OK

1、设置Info.plist中的View controller-based status bar appearance为YES

2、然后在AppDelegate.swift中的

func application(application: UIApplication!, didFinishLaunchingWithOptions launchOptions: NSDictionary!) -> Bool

方法中加入：

UINavigationBar.appearance().barStyle = UIBarStyle.Black

OK，就是这么简单。这样状态栏的字体就变成白色了！